Furnace bridge-wall



(No Mod T REESE,

FURNACE BRIDGE WALL.

No. 382,109. Patented May 1, 1 888.

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IlNrrEn STATES PATENT OFFICE.

THOMAS REESE, m, on ERIE, PENNSYLVANIA.

FURNACE BRIDGE-WALL.

SPECIFICATION forming part of Letters Patent No. 382,109, dated May 1,1888.

Application filed JauuaryBl, 1888. Serial No. 262,564. (No model.)

. hereby declare the following to be afull, clear,

and exact description of the invention,such as will enable othersskilled in the art to which it appertains to make and use the same,refer.- ence being had to the accompanying drawings, and to the lettersof reference marked thereon, forming part of this specification.

My invention consists inthe improvements in boiler-furnaces andbridge-walls, hereinafter set forth and explained, and illustrated inthe accompanying drawings, in which- Figure 1 shows a verticallongitudinal sec tion of my improvement, the boiler beingshown inelevation. Fig. 2 shows a cross-section of same on line a: 00 in Fig. l,the boiler notbeing in section.

Like letters refer to like parts in all the fig ures.

The principal objects of my invention are, first, to provide air ductsor passages in or adjacent to the bridge-wall for conducting air fromthe ashpit, and heating, conveying,

and intermixing it with the unconsumed gases.

as they pass over the bridge-wall and into the combustion'chamber, so asto facilitate their .combustion; second, to construct the rear of thefire-box and the air-passages in and adjacent to the bridge-wall in suchshape thatthe air in passing from the ashpit to the exit-openings in thebridge-wall will be subject to and will absorb the maximum amount ofheatprac- 'ticable.

The features of my invention will appear hereinafter in thespecification and claims.

In the construction of my invention shown the boiler A is supported bymeans of brackets B B, secured to each side thereof, which rest uponledges D D on the side walls, E E, of the boiler-setting so as to leavethe lower half, longitudinally of the boiler, exposed to the action ofthe fire. At the rear end of the boiler, however, wing walls F F extendinwardly, closing the space between the side walls, E E, and the boilerA, so as to force all the products of combustion through a constrictedopening,G,directly beneath the end of the boiler.

The bridge-wall of my boiler-furnacel construct of a rear transversewall, H, which is adapted to support the filling I, forming the bottomof the combustion-chamber J, and in front of the wall H,and somedistance from it, I build another transverse wall, K, of somewhat lessheight than the wall H, so as to leave a vertical chamber, M, betweenthem, and through the wall K, I construct an arched passageyL, whichopens at one end into the vertical passage or chamber M between thewalls H and K, and at the other end into the ash-pit N, the end of thepassage L next the ash-pit N being,however,provided with a door, 0, asand for the purpose hereinafter set forth. On each side of the door 0from the transverse wall K, I build longitudinal walls P P, which extendinto the ash-pit Nfar enough to serve as supports for the centralportion of the transverse grate-bar support Q and the inclined rear end,B, of the firebox W.

On the top of the rear portion, H, of the bridge-wall I secure a cap orplate, S, adapted to receive and retain a fire-brick fire surface orlining, S, the front side, T, of this plate or cap S extending over andcovering nearly half of the width of the vertical chamber M. Over and atsome little distance above the top of the wall K, I secure a cap orplate, U,so as to make a horizontal passage, b, between thebottom of theplate U and the top of the bridgewall K, the plate U being adapted tosupport a fire surface or lining, U, and also extends over thechamber'M, so that the rear edge, V, thereof nearly meets the frontedge, T, of the plate S onthe top of the wall H, leaving a narrowtransverse slit, a, between them nearly central over the chamber M. Theslit a being wider at the bottom than at the top, any dust or ashesentering it will fall freely to the bottom of the vertical chamber M,when they can be removed through the passage L in the wall K and thedoor 0, opening into the ash-pit N.

From the grate-bar support Q to the top of the front edge, V, of the capor plate U is a plate, R, which stands, preferably, at an inclination ofabout forty-five degrees and forms asupport for the fire surface orlining of firebrick, forming the back end, B, of the fire-box W. Theupper edge, d, of this plate R is so secured that it does not quitetouch the front edge, V, of the plate U, leaving a narrow transverseslit between them, the inclination of the sides d and V of the slit ebeing such that it is wider at the bottom than at the top, so that anydirt or ashes entering it will fall freely through the air-passage f tothe bottom of the rear end of the ash-pit N.

It will be readily seen that the arrangement and location of the plate Rwith relation to the front of the wall K, forming the air-passage f, andof the plate U, so as to-form the horizontal air-passage 6 between thebottom of the plate U and the top of the wall K, is such that all of theair passing out of the opening a is subjected to the heat from theplates It and U, which become very hot from the intense heat of the firepassing from the rear of the fire-box W over the top of the bridgewall,and the air passing out of the opening 6 is subjected to the heat fromthe plate B, so that the air issuing from the openings e and a becomeshighly heated in its passage from the ash-pit N thereto.

Another feature of my improvement is that the air-exit openings 6 and aare located at quite a distance apart, one of them, 6, beingsubstantially atthe extreme front edge of the briclge-wall,while theother, a, is near the rear edge of the bridge-wall, so that the firstcurrent of air is supplied to the unconsumed gases just as they leavethe fire-box W, and the second just as they enter the combustion-chamber.I, and,as the top of my bridge-wall is considerably wider than the topsof bridge-walls as ordinarily constructed, the air-exit openings 6 and aare far enough apart to inject the heated air-currents into theunconsumed gases at the points desirable for producing the best results.

In the description of my invention I have referred to the openings 6 anda as transverse slits. The form of these openings may, however, bevaried, if desired,as other forms of exit-openings will produce goodresults.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is-

1. The combination, in a boiler-furnace, of

two plates, one an inclined plate, forming the rear of the fire-box,andthe other a horizontal plate without openings therein over the top ofthe bridge-wall, and air-passages between said plates and the frontandtop of the bridge-wall, with one transverse air-exit opening between therear edge of the inclined plate and the front edge of the horizontalplate, and another transverse air-exit opening at the rear edge of thehorizontal plate, whereby the air in its traverse from the ash-pitthrough said passages is brought into contact with said plates anddischarged into the furnace at two points only, one at the front edgeand one at the rear edge of the bridge-wall, substantially as and forthe purpose set forth.

2. The combination, in a boiler-furnace, of the plates R and U, formingthe upper walls of air passages f and b, and adapted to heat the airduring its passage through them, with an air-exit opening, 6, from saidpassages between the plates R and U, at the front of the bridgewall, andan air exit opening between the plate U and a plate, S, at the rear ofthe bridge-wall, substantially as and for the purpose set forth.

3. The combination, in a boiler-furnace, of the bridge-wall K and therear Wall, H, with the rear wall cap-plate, S, the plate U, raised abovethe bridge-wall K, the air-exit opening a between the plates Uand Satthe rear of the bridge-wall, and the air-exit opening 6 between theplates U and R at the front of the bridgewall, substantially as and forthe purpose set forth.

4. The combination, in a boiler-furnace, of the wall H, cap-plate S, thebridge-wall K, the plate U, and air-exit opening a, with'the passagesand M, communicating with the opening a, the opening L through thebridge-wall K and its door 0, the wing walls I P, supporting the rearplate, R, of the fire-box, the air-passagef, and the air-exit openingeat the front of the bridge-wall, substantially as and for the purposeset forth.

In testimony whereof I affix my signature in presence of twowitnesses.

THOMAS REESE, JR.

Witnesses:

WM. P. HAYES, W. H. BILLING.

